Two Friends,Monica and Chandler,enjoy Baking Bread and Making Apple Pies

Multiple Choice

Two friends,Monica and Chandler,enjoy baking bread and making apple pies.Monica takes two hours to bake 1 loaf of bread and one hour to make 1 pie.Chandler takes four hours to bake 1 loaf of bread and four hours to make 1 pie.
-What is Monica's opportunity cost of baking 1 loaf of bread?

A) 4 pies
B) 2 pies
C) 1 pie
D) 1 loaf of bread
E) 1/2 loaf of bread